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Interface-induced superconductivity and strain-dependent spin density wave in FeSe/SrTiO3 thin films

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arxiv 1301.2748 v1 pith:O7MX6O62 submitted 2013-01-13 cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

S.Y.Tan , M.Xia , Y.Zhang , Z.R.Ye , F.Chen , X.Xie , R.Peng , D.F.Xu
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Q.Fan H.C.Xu J.Juan T.Zhang X.C.Lai T.Xiang J.P.Hu B.P.Xie D.L.Feng
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classification cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
keywords fesefe-htsfilmssingledensitylayerrecordspin
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The record of superconducting transition temperature(Tc) has long been 56K for the iron-based high temperature superconductors(Fe-HTS's). Recently, in single layer FeSe films grown on SrTiO3 substrate, signs for a new 65K Tc record are reported. Here with in-situ photoemission measurements, we substantiate the presence of the spin density wave(SDW) in FeSe films, a key ingredient of Fe-HTS that was missed in FeSe before, which weakens with increased thickness or reduced strain. We demonstrate that the superconductivity occurs when the electrons transferred from the oxygen-vacant substrate suppress the otherwise most pronounced SDW in single layer FeSe. Besides providing a comprehensive understanding of FeSe films and directions to further enhance its Tc, we establish the phase diagram of FeSe vs. lattice constant that contains all the essential physics of Fe-HTS's. With the simplest structure, cleanest composition and single tuning parameter, it is ideal for testing theories of Fe-HTS's.

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  1. Preformed Cooper Pairs in a Triclinic Iron Pnictide Superconductor

    cond-mat.supr-con 2025-01 conditional novelty 6.0 of 10

    In a triclinic iron pnictide superconductor, a spin resonance precursor, Nernst signal, and NMR density-of-states reduction all point to preformed Cooper pairs persisting to T* = 45 K, above Tc = 30 K.

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